CN1372071A - Pneuamtic wave countervailed waste gas recirculation exhausting silencer system for internal combustion engine - Google Patents

Abstract

The exhaust silencing system includes an exhaust pipe connected to exhaust opening of engine by flange and a silencing chember formed from small air-tube and expansion chamber connected with exhaust pipe, and is characterized by that its exhaust pipe contains a negative pressure pipe connected with casing of engine, the middle portion of the negative pressure pipe contains a conversino absorption tank, and rear portion of the negative pressure pipe contains a small air-tube connected with air intake system of engine, said invention utilizes the pressure wave cancellation system created by negative pressure pipe between exhaust pipe and crankcase so as to solve the contraditional between engine power output, waste gas discharge, fuel consumption and exhaust noise.

Description

Pneuamtic wave countervailed waste gas recirculation exhausting silencer system for internal combustion engine

The present invention relates to a kind of exhausting silencer system of internal-combustion engine.

Exhausting silencer system is requisite parts on the internal-combustion engine, whether normal power output and the toxic emission and the oil consumption that directly has influence on motor of its work.How reducing its exhaust sound when improving engine power output is to make engineers and technicians feel difficult thing with harmful exhaust.This be because motor in work during exhaust, because the resistance of exhausting silencer system, make air pressure in the outlet pipe greater than the pressure of remainder of exhaust gas in the cylinder, thereby cause the part exhaust gas recirculation, make the fresh gas flow minimizing in the firing chamber and cause mixed gas dense partially, make engine combustion insufficient, and increased oil consumption, finally make power output be subjected to very big influence.This exhausting silencer system comprises that one is connected to the outlet pipe of internal combustion engine air vent by flange, and the anechoic room that links to each other with outlet pipe, several is arranged by the continuous expansion chamber of little breathing pipe in anechoic room.Be appreciated that this sound-attenuating system can obtain power output preferably when high engine speeds, and it is just undesirable in its power output of middle low speed segment, its the underlying cause just is that motor is when middle low speed segment turns round, a highpressure zone is arranged near relief opening, this zone makes the part exhaust gas recirculation when increasing exhaust resistance, be the important place of causing the problems referred to above.Changing one of above-mentioned defective simple effective method is exactly the working aperture that enlarges little breathing pipe in outlet pipe and the anechoic room, though make the power output of motor obtain improvement to a certain degree like this, the noise of exhaust is increased, and can't reach the noise elimination purpose.One of a kind of feasible scheme just is to use turbo charge system, and this system increases the live gas of firing chamber in can the scavenging dynamics when strengthening engine exhaust, and the power output of motor is significantly improved.Also having a kind of scheme is exactly the suction fan of setting up a brute force in outlet pipe, thereby reduces near the air pressure in motor highpressure zone the relief opening when middle low speed segment exhaust, to reach the purpose that increases power output.Another is exactly in the anechoic room behind outlet pipe catalytic convention design to be installed, and is used for filtering the harmful matter that transforms in the waste gas.Although these several schemes have really played certain conclusive effect to the improvement of power output, oil consumption, toxic emission and the exhaust sound of motor to a certain extent.But everybody can see, these four themes of power output, oil consumption, waste gas, discharging and the noise of motor are that mutual restriction, tangling, when power output gets a promotion, oil consumption has sacrifice to a certain degree again, when exhaust sound was decline to a certain degree, power output can be subjected to certain influence again.Though above-mentioned several schemes all have independently different improvement to these four themes, its user cost but greatly improves, and therefore still can not fundamentally solve above-mentioned technical bug.

Purpose of the present invention just provides the I. C. engine exhaust sound-attenuating system that pressure phase of wave that a kind of exhaust pressure wave that utilizes internal-combustion engine and the motion of crankcase inner carrier produce disappears.

The present invention has just designed a negative pressure pipe in the front portion of engine exhaust sound-attenuating system on the outlet pipe, this negative pressure pipe links to each other with the casing of motor.Be equipped with one at the middle part of negative pressure pipe and transform tourie, be used for absorbing or transform the harmful matter of process thus.At conversion tourie rear portion one little breathing pipe is arranged, can link to each other with the gas handling system of motor.When motor in running during exhaust, the lowpressure that forms to the top owing to piston motion in highpressure that produces in the outlet pipe and the crankcase, make the part high pressure draught turn back to crankcase, when reducing exhaust pressure, part is utilized again by the energy of exhaust loss by bent axle.And in highpressure that when descent of piston moves, in crankcase, produces and the outlet pipe since exhaust finish to produce with respect to the lowpressure in the crankcase, thereby make air-flow outwards motion again in the crankcase.This gas flow that is produced by the height draught head is reducing the anticyclonic while that exhaust forms, and makes the part energy of exhaust obtain again utilizing, and the noise of exhaust is linearly descended.This transformation makes motor produce basic variation, and this comprises that the residual gas in the firing chamber will reduce, and the movement velocity of piston gets a promotion, suction pressure is improved, this will make the burning of motor more abundant, oil consumption still less, thereby power output will promote comprehensively.And owing to transform the effect of tourie, make a part obtain filtering or absorbing in the harmful matter of this gas that moves back and forth, and further make in the crankcase and be penetrated into harmful exhaust in the crankcase by cylinder wall and further enter gas handling system and rekindle by motor by little breathing pipe, thereby reduced the discharging of harmful exhaust effectively, and in the omnidistance running of motor without any sacrificing and compromising.

The present invention is owing to make the exhaust pressure of motor and the air pressure interaction that the motion of crankcase inner carrier produces by the negative pressure pipe, and then set up Pneuamtic wave countervailed system, thereby the exhaust sound straight line is descended, and owing to absorbed the energy of part exhaust loss, the discharging of harmful exhaust is reduced, and oil consumption descends.Solve the contradiction between power output, oil consumption, discharging and the exhaust sound that exists on the motor, thereby had application and promotional value widely, and will produce positive society and economy benefit.

Accompanying drawing is that exhausting silencer system integral body of the present invention is analysed and observe analysis chart.

As you know, engine's exhaust system comprises that one is connected to the outlet pipe (5) of engine exhaust port by flange (7), is connected and installed with the anechoic chamber that little breathing pipe (2) and expansion chamber (3) are formed behind the outlet pipe (5).The present invention is in the front portion of vent systems, and just outlet pipe (5) is gone up design a negative pressure pipe (6), and this negative pressure pipe (6) links to each other with the casing of motor.Being appreciated that can be according to various connecting means of different engine design and link position, and this connecting means can be Connecting format such as flange or sleeve pipe.Be installed with one at the middle part of negative pressure pipe (6) and transform tourie (4), its function is to make thus that the harmful exhaust of process is purified.And a little breathing pipe (1) has been installed at the rear portion of negative pressure pipe (6), this little breathing pipe (1) directly links to each other with the gas handling system of motor, make the interior harmful exhaust in cylinder wall leaks into casing of crankcase be sent to gas handling system, enter motor again and rekindle by little breathing pipe (1).When the engine operation exhaust, air pressure that increases in the outlet pipe (5) and crankcase are interior because piston motion has formed strong contrast to the lowpressure that the top exhaust forms.This draught head that is formed by high lowpressure forces the part high pressure draught in the outlet pipe (5) to be pressed to crankcase by negative pressure pipe (6).When piston moves downward air inlet, in crankcase, will produce than outlet pipe (5) owing to exhaust finishes the highpressure forms, force the interior portion gas of crankcase to turn back to outlet pipe (5) again through negative pressure pipe (6).This gas flow that is formed by the height draught head has produced positive and basic influence to the running of motor, this influence power is included in when reducing exhaust resistance, motor is utilized by bent axle again by the energy part of exhaust loss, owing to absorbed the part exhaust energy, to the exhaust sound of motor linearly be descended, and the movement velocity of piston and suction pressure are improved, this will make engine combustion more abundant, oil consumption will significantly reduce, and will make the body vibration kinetic energy of motor descend 30%, thereby the power output of motor is promoted comprehensively.And purified the waste gas that part moves back and forth in negative pressure pipe (6) by transforming tourie (4), and make the harmful exhaust of the seepage in the crankcase further send into gas handling system by little breathing pipe (1) to rekindle, thereby reduced exhaust gas discharged effectively by motor.Can see in the implementation process of the present invention from the above description that the present invention is applicable to single cylinder and the multi-cylinder gasoline or the diesel oil four stroke engine of any discharge capacity, in whole process without any sacrificing and compromising.Although it is clear that the present invention has set forth by special model, as any different change beyond the present invention's spirit scope all will no longer be issued a separate notice with repairing into.

Claims (3)

1. waste gas recirculation exhausting silencer system for internal combustion engine, this sound-attenuating system comprises an outlet pipe 5 that connects engine exhaust port by flange 7, and the anechoic chamber that forms by little breathing pipe 2 and expansion chamber 3 that links to each other with outlet pipe 5, it is characterized in that: the negative pressure pipe 6 that connects engine casing is installed on outlet pipe 5, and negative pressure pipe 6 middle parts have one to transform tourie 4.

2. waste gas recirculation exhausting silencer system for internal combustion engine according to claim 1 is characterized in that: negative pressure pipe 6 has little breathing pipe 1 to link to each other with the gas handling system of motor.

3. waste gas recirculation exhausting silencer system for internal combustion engine according to claim 1 is characterized in that: transform tourie 4 for dismountable.